I built mine with parts from http://www.competitivecyclist.com or you can buy a complete bike. I have a Trek XO2 and a Scott S55.
Reviews at http://www.bikeradar.com and http://www.cyclingforums.com
Some other sites - Nashbar, Performance Bike for parts
1. Don't buy a piece of sh1t
2. Get it from a decent local bike shop. LBS
3. Get it properly fitted. Not talking just moving the seat up and down, but properly measured by a salesperson who cares.
I have a hybrid piece of s*** bike that stays out on the bike rack year round that I use for getting aroung campus. As soon as I graduate, it's getting sold.
I also keep a road bike in my room that I only bring out for serious training rides though. If you're talking about riding on roads just to get around town, then you're best bet is with a cyclocross or a hybrid. If you are going to be going out on country roads for training or group rides, get a road bike.
You're only giving away your man card if you buy a fixed gear. But hey, D******** are cool right? NSFW: http://www.youtube.com/watch?v=lVmmYMwFj1I
And that, kids, is why good posture and suspension are VERY important
I don't know where I stand when it comes to saddles. On a roadbike, you can get away with basically an ergonomically formed plank, a MTB i like to have some more padding for the increased impact forces. Currently rock the same BBB saddles on both, it's a nice compromise. I learned riding on a bike with a solid saddle, then moved on to cutaway saddles, and I never looked back.. Solid saddles for any prolonged amount of time are **** wreckers..
Does anyone have any experience with one of these,i have the oppptunity to buy a second hand one ?http://www.militarybikes.com/paratroopervid.html